diff --git a/.travis.yml b/.travis.yml
index ce39c6a..7af9c0f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,7 +13,7 @@ env:
       - PLAT=aarch64
       - NP_BUILD_DEP="numpy==1.17.3"
       - NP_TEST_DEP="numpy==1.17.3"
-      - CYTHON_BUILD_DEP="cython==0.29.24"
+      - CYTHON_BUILD_DEP="cython==0.29.30"
       - WHEELHOUSE_UPLOADER_USERNAME=travis-worker
       - TEST_DEPENDS="pytest pytest-xdist hypothesis"
       - TEST_DIR="tmp_for_test"
@@ -37,7 +37,6 @@ jobs:
         - MB_PYTHON_VERSION="3.10"
         - NP_BUILD_DEP="numpy==1.21.2"
         - NP_TEST_DEP="numpy==1.21.2"
-        - CYTHON_BUILD_DEP="cython==0.29.24"
         # Xenial is EOL and the pip there doesn't support python 3.10
         - DOCKER_TEST_IMAGE="multibuild/focal_arm64v8"
 before_install:
diff --git a/azure/posix.yml b/azure/posix.yml
index 94907f5..128deb2 100644
--- a/azure/posix.yml
+++ b/azure/posix.yml
@@ -12,7 +12,7 @@ jobs:
       BUILD_COMMIT: "v1.4.2"
       PLAT: "x86_64"
       NP_BUILD_DEP: "numpy==1.17.3"
-      CYTHON_BUILD_DEP: "cython==0.29.24"
+      CYTHON_BUILD_DEP: "cython==0.29.30"
       NIGHTLY_BUILD_COMMIT: "main"
       NIGHTLY_BUILD: "false"
       TEST_DEPENDS: "pytest pytest-xdist hypothesis"
diff --git a/azure/windows.yml b/azure/windows.yml
index ea95d53..0697bdc 100644
--- a/azure/windows.yml
+++ b/azure/windows.yml
@@ -10,7 +10,7 @@ jobs:
     variables:
       BUILD_COMMIT: "v1.4.2"
       NP_BUILD_DEP: "1.17.3"
-      CYTHON_BUILD_DEP: "0.29.24"
+      CYTHON_BUILD_DEP: "0.29.30"
       NIGHTLY_BUILD_COMMIT: "main"
       NIGHTLY_BUILD: "false"
       PYTHON_ARCH: "x64"